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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02fbf88521d5245a722cb5337e807dfc1e907cf1ed8cfc4992f9622943491cc0' 
  AND token = 'U+Bs5NP/ZjsNPeKezcLt2dpo4Q3tvuY0FtJPTppfj6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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