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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d60110a56387ffbae64aae0bf13c159be2da9558d7d0cfb452e9a7e81fce2c' 
  AND token = 'OOrZblWXrEkh4Qz8tFERvVYoDkKN5thYMF75leq7pZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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