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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e1cb2d78df33c94131ccef488219e7e0b26d2d8a219db031ace63d17fd87a1' 
  AND token = 'uxCqpE8i9vG83XwuJ1Ob/CpdQappXkmp/FdG+fvBKd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}