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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c63745119060eafdb3a29074503992f785127a1cfc72cbdb9f9236f64bf13bf' 
  AND token = 'Sv8Val/ach278Fb3Zk05PP7RTIEcq5ut0/OxyaHjNhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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