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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9665de15fbda71dd2c171c958b5d89b6d310d6cfae96eea4492cf9541e1ac750' 
  AND token = '0iM6clI9ogjURrj4uRI/Z1xqB8yFmZXckGrr4hGTkLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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