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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb8e8b3995e6bf9b065a4990808394f1e10c9e5e173dbb18a079bdddd503a86' 
  AND token = '/AMboIayNgTXNlZ6R56hokUw/pS6H78oDbJ/IaL44/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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