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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b43ed8d0a5b821cb623ef89fa6ca3a57d0f1ef163888a3539bf7ad88373923' 
  AND token = 'Trz4Zb2H0alw38ay3/4kFozfxILfW/RVAk86d9w+FsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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