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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a670cf4d685e92b98e07e664908a6b6228fad0f9e3e180f680be7890cbcdaedf' 
  AND token = 'cW5LQri2+nTi9FlvH8Dq38I5DB2G1+414ums9CcL+AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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