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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a364137f95024e7fde9106c1dd434aac7e0303fee0d996d1ff6b40acc6af9daf' 
  AND token = '2QdeNjIxvOUQEEOzud4QA3fYs6Nutk4Ep9XgSGdNP78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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