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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70fcf714563109bf7544e071de737fff9924fc8cc011f1c6fbc6118ebe97cf61' 
  AND token = '3j4VYkeVDk3OFIvhYQ/eZYoegsMhPXgevqQ/So5geoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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