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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d5893a5b9769586cc439c05a82f29e7c0b249849b9db279e4c3ac40ba21920' 
  AND token = 'R6N/SvXaBVK8kQA+1Qqe3gfSoyxfKFbA9A2B1tva0oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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