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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ddc5bd5dac683099e300eddece369cd8f90541f8acdc2f8d56cc3ae22fd573' 
  AND token = 'l7PezAJe33aRv5K59kYYyv7qa/xArkg2+Pqe8M9iLZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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