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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff7af3f6b2a9750b51b16fac2d557d7cd497b2d4ea9386919695b943e8b53d1' 
  AND token = '8MtE6d2a6IKJgq0gr8il6/4vUDdeXAG6N7zklC3jhTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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