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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c428cd7102bcafa1dda9ddbaab25cfa69fc0233e5b22f5a185ca1a240eb6fe' 
  AND token = 'ajRYRWWNep+wjkWFkCDrT6J+oqz3Vf3DRuKOcW4H0WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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