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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5aa97a987384742a5e4c92b2b4344f8eb16b57c135b88c5b7c4867ef498ed97' 
  AND token = 'SbbYgmXWAvHM0jPyOc3RdCvz0fyWuRL1vFXvNqTrsKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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