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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12926c25ad4a70083112974fc2b96c112ded5d9bc4e9185f4712016cf2081ea4' 
  AND token = '1P2zfis1WfcCFiqsVCwqfXII6/2srmcSsGtKHtZWo48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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