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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0faadce780414fada408a9427938423219ce887fd087a7f606d15e7479ddeec3' 
  AND token = 'JIFdU4qNRSuxDVbixTrSHnhjNmissShinFlHgbiHt10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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