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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0faf4ace9d350b8ec1c027187b18cc5e995bb201ff78ee785211be5d28953c2' 
  AND token = '8Sqwwnc4NFTI6GP4ZYEQYeIwPp43nwti6fYjEhdV3Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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