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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a9738722a5004f9fc3934886d49aab82b0c66b151526408e226587f75b7cab7' 
  AND token = '7U/E04TsacAyQAQADCAOjgekhDvmlLHD6pSIXlOrIwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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