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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff5eb053eab8926c4ef5ca1c55d9ac0eeb05fb4ce31f8f0856ccd87ca6307d5' 
  AND token = '9Sya3sU8wB5/1oKJFYfAmpypdSMP9EBfYLYXOkkfkHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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