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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e83c06d37c7228f13595b556df33b16b93045a81b680a72813d48e66fda542' 
  AND token = '179mK+T92AwVBUINjHQOb0rM69ckLacN5hJvNpaZRjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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