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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f72949a69b6d9da0e7d88d53381f8d0ea95d3ca252e871dbfd7e71737bf0cd' 
  AND token = 'Y3ugnwNoa/MdmrkFd6vNzVKCsPgfNbtwPr/L3Lb99aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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