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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dffeda527d8b1f8d6fb3c43d2e6f4b105383dc076d673c14d8c63b30b181094d' 
  AND token = 'lBMDI9Vr3XohHC8bdcGfRUM2KOFMDkR9Y+pJSX5FarM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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