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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26384b9c9049c4dd719ca6ab634d96013655c735ce06540f63a667e3c7662a9b' 
  AND token = 'FDuhzH+Ma+MZ2CkI3wONTxHmvKvZ4vZZS/HydSKlucw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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