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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f8833f88ff12ad2419c3c13b98cdcc26a4f0aa11c5582473e7bd9c2f1419496' 
  AND token = 'rpfwWLiB5BwB5V9FJtDzO437OjllvXErkO6XWxrzqs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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