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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b2acc196797137b7d2b7890f98839d905f42a69b7457b6ea7a630036edd502c' 
  AND token = 'THqxLBfr3sHOe1eNXSMBI/OEYH5hpjJrDZ11obYuA8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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