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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33347a7ad3577e8ab9718c1271866c1ff91b33a4fb860c1e9d0340d62323f566' 
  AND token = 'nMrDN4AcdXacOyR+P6uElwW0A/QLUhkT/20a0zVD+VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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