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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2df2ec354d6705b3ed0d8f2b6fcebf55db544ac7b9ca15190277c8727a695c33' 
  AND token = 'MIpTcNsMORFQR17aK+dXaAwMsI9isc9jIckUY2HoR9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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