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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42aaabac16d088c430587b2fb5fb0202270c6465052bd4326e628ced53dd46b7' 
  AND token = 'cIlsjq7RD8KnJEBdIdJYBfZ67E8xYhtSrsR7ah4gtPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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