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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5702c4b383e21da4f5b5cee5826f26a99a448a90cc70935cfbc3a81902028eb' 
  AND token = 'GHeEXHacIanwwUJ/06H4x4iDXfB+5+e9KgvoCoMeM4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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