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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69baa70b5ce52d31c123f2de0192cf854a0f9d9f3b5150be40e081aa3776ee76' 
  AND token = 'yJC5YUFU2vw/Nrgj4a5cnKMCu5wYfTyVG9Ey2rpDFSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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