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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f96fa4fe3749d59a366dfcec44b8df12c0ddd9266a04836afef1fe73127ed231' 
  AND token = 'wfkoBD9Hrnk8vnkS8m93JX+rg6bxnaOAY6Gp3wZd29s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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