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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f374b284e6d4a6f4e2020128f207db63ea976a8b3bb60cf246e6848ef616ee74' 
  AND token = 'u28V6au46GZRIxgkwchUAeCxlLGdW5zJOnD/nxGnlW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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