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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa567238609761b92e4b1556d6722e1819a9c74f7563367e04175ff0f9c9fa0' 
  AND token = 'Q2JmX02z9h1czJGH9tDLQ8NzSFk6Vvy3pszg6N5BJ/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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