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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a2e187b57bd08bc551cedd39a848571ae4b7d5b7f9ec06c605af091062cfad' 
  AND token = 'qXW0BbOjHbOgGeXVZd9ip835Qzr8uBwF3cwI5aJYSp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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