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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b52c1f0d02d29a88ec8279f289f8b7883b0711ee2a5f88580844c87b9d412221' 
  AND token = '0giU+fCYJ+oGgluSYckV1cnjpr5RUci4TU7WkTN/FE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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