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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c02a6d199437ed22b84e24c5dc2976e9ccaf0c0b5d20662fad548f4b845be20' 
  AND token = '6zUsKj5PkJuDAD66WZGsbjGYyTTdy7mgPA1KO8dvwE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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