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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c901cd0ce6fd615f6b6ae86390dc7f4e62d47f31d013594470682b5dacbfeb' 
  AND token = '1QRjF01Xyvxhsy5Djh7qr0C50chQXfCwsndUV5VzdF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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