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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a530cfbedfcac0761c823313e031b9ef5367825d027d7eeeb44d5c7140c94cdb' 
  AND token = 'w11Nx/3DBRjQABNVcZBDz3QGBsmQs1I7hby65bheKmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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