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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84f58b3cea5ee5f49dcd833443c01f36ecadceb76c35088e6e4a8742f525764' 
  AND token = 'JEtcuQqTXgmr0n7s+HWOFcE897yNbqRH4lrBYjWvJKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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