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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a067f266d6e16320b2296aec5a26d617703e076849182bba929de8fc84e3b5' 
  AND token = '2NGw6RiF+TwrRdRuztvG4jknlGKt4V3rpkC+hVntIAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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