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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb29690c7c7b2591340628463cb801d57805cf51e91774305ef0b40d9ca97f3a' 
  AND token = 'Z7Vq/1mT1/qK7FCD88me8FZaS5k8d6fx6Yvux+9BMu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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