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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '094ba15b0555e40d0deadae67f32b5e56088b93908a33a3280ab77873c7870cf' 
  AND token = 'ZPb8dS9W6mixCO0My4+tBBlddOgEID6teTzwf52vwmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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