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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34635264e1f41e76633bcccd3a09dc04efa9299f0d592362824802e335eec341' 
  AND token = '/iGtSsXpgGCPaD51PYLuv1yju8RgzqPQkGlyfg+WYO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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