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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d3a131bd3c258ba58dad930b85a5496218b89004893714618e1e31b331ee569' 
  AND token = 'fka0dqmNqkFAxRho8WYhzqEoWt6zLlp3G/MNEFFrjTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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