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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4e9079e485ecf36301504cf1eee40439e19d6ac63fa43ff9f955849d4a0b86f' 
  AND token = 'cxB/Wbj2WnGik/NbCVTsaFP0fOB9y0aCnVe1+OKDBlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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