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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb7d6b51bec37c98e2da845d1b49cd62d1d86fcfb305406b27a870d30b048fc' 
  AND token = 'Ga30WMplpXuaieP5dgQxrkfKr9pUrEvHp33qTHVaBL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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