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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffbcbb65c5f0e9c8934ddc875385b0b5580212a8a6a6fda6ccb3eab71e1108d7' 
  AND token = '98S+PXdszdDI1B7DOl6W7BbK1jolqqR92JGLLA5i8AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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