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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb1ab4f05e3044aa6e2a8f34a03adc3488c0b0708d020078b0693409b9d8eb7' 
  AND token = '7amSA8PPO3GKStGQ+E9wM3mcz2orzrNPVLUJ1yM8em0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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