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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26b4ba67a04a3466d2ed13bd838ccd4b31f51f90abdb828b6677dc2cceabd8a7' 
  AND token = '+3+xdw40qs+rN/0MDQGgTJvjSIMp+fimTfgPLD80JW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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