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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd7bb0848c3aba8e9f224bf8bc7cb2ed39ae0d02ce6caa82553e03a78f1b31b' 
  AND token = 'mG7An2PA/KiAbohO93iDMFVRG/3pqF5npRpZEFDwp78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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