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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c932f45da6de3fadbdda3bdf6bb61d488c99120c38ce5e8edf91fbf9d0929a5f' 
  AND token = 'L5DoCFsjZ3DLqB++2BgWQPlPP8nEzjmQc+HCU7MByjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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