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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600f5889684df4e115026172288da9ee4367a850db78bcbfce33335a3d07881d' 
  AND token = 'z6jJvNqqzb0Jo/7jQQN8ewB6CQB3urp7E1Swnh245rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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