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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7dd2806e647d59f68978e01021bd184349e590dcc30175cd58b548c60bfdd3' 
  AND token = '9s0oLdW+OKYAG3f1Qe5fllequ85Q3K4YNpenQA25fWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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